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how do i check a valliant combi boiler expansion tank?

water dripping from expansion tank,on valliant combi boiler
Colin, November 2010
you depress the car valve on the expansion vessel, no water should come out if it does diaphram gone a new expansion vessel needed.
if just AIR comes out you will then need to re inflate the pressure vessel back up to 1 bar max with a CAR PUMP with NO pressure in the waterside of the system while you inflate the pressure vessel .

wirecutterman, November 2010
link Click here to see other fixes for Vaillant.